Hermetically sealed tin and like container



3 J. D. N. WARRE-N HERMETICALLY SEALED TI'N AND LIKE CONTAINER Filed Sept. 4, 1934 Patented Dec. 1, 1936 UNITED STATES & Son Limited, company Y Paisley, Scotland British Application September 4, Sefial No. 7452 661 X In Great Britain September 4,1933

4 Claims.

This invention comprises improvements in or relating to hermetically sealed tins and like containers, such for example as those used in the packeting of tobacco.

The invention is concerned with a container of the type (hereinafter referred to as the type described) comprising a body portion and a pushon flanged lid, combined with an annular jointing strip or layer such, for example, as a rubber ring (which will hereinafter be referred to as the jointing ring) located between the wall of the body portion and the lid in such a manner as to provide an airtight seal between them when suction is applied to the interior of the container after the contents have been inserted.

In tins of the above type it is necessary to provide some means for breaking the vacuum seal to permit removal of the. lid when access to the contents is required. The object of the present invention is to furnish a simple method of breaking the vacuum seal.

According to this invention a container of the type described in which the jointing ring is disposed wholly within the compass of the lid flange is characterized in that the lid is provided with an opening in the flange opposite to the edge of the jointing ring and so shaped and arranged that, while it will not normally interfere with the vacuum seal, it will give access from the exterior to permit of the ring being readily dislodged or broken to release the vacuum by the insertion of a coin, penknife, nail file or similar device.

One specific construction according to the invention will now be described by way of example, with reference to the accompanying drawing in which:

Figure 1 represents an elevation of the container, and

Figure 2 a cross-section of the container shown in Figure 1.

In this construction the mouth of the body portion I of the container is formed with a rolled over edge 2, the jointing ring 3 is disposed between this edge and the disc portion of the lid 4, and the access opening 5 to the jointing ring is formed as a slot in the flange of the lid near the junction between the flange and disc portions of the lid and parallel with the edge of the lid flange so that when the lid is in position the slot will be opposite the top of the rolled over edge of the body portion and the edge of the jointing ring. The slot is of such depth that when the lid is in position the whole or a substantial portion in the depth of the jointing ring will be visible at the slot. The object of this arrangement is to ensure that by insertion through the slot of a coin or a knife or other instrument capable of passing. through the slot, contact can be made with the jointing ring, itself, and the latter thereby readily dislodged from position and the seal broken. If desired, the disc portionof the lid may be formed with an annular channel 6 to locate the jointing ring. The rolled edge at the mouth of I the body portion of the'tin is formed by rolling the metal inwardly to form a rounded'lip, the exterior surface of the body portion being of substantially uniform diameter throughout its depth, except immediately adjacent to the rolled. edge where the body portion is tapered inwards a suflicient amount to bring the rolled edge against approximately the centre of the jointing" ring.

I claim:

1. A container arranged for vacuum sealing and comprising an open-mouthed body portion consisting of a base and an upstanding annular wall, a push-on lid consisting of a substantially flat plate portion and an integral peripheral flange arranged to fit over the mouth of the body portion embracing the upstanding wall thereof, and an annular jointing strip disposed wholly within the compass of the; lid

flange and located between and engaged by the thereof adjacent to the inwardly curved mouth and an annular jointing ring disposed wholly within the compass of the lid flange and located between, and engaged by, the top-piece of the lid and the extreme edge of the mouth of the body portion wall, the lid having a slot in the flange opposite to the edge of the jointing ring and extending parallel thereto.

3. A container for vacuum sealing comprising a body portion open at one end and consisting of a base and an upstanding annular wall, a push-on lid consisting of an end plate and a peripheral flange arranged to fit over the annular wall of the body portion at its open end,

and a. flexible sealing ring disposed wholly within the compass of the lid flange between the open end of the body portion wall and the end plate of the lid, the body portion wall and the lid end plate being so shaped that when the container is assembled the flexible sealing ring will be seated upon the extremity of the body portion wall and will extend beyond it to the lid end plate, and will be seated upon the lid end plate and will extend beyond; the adjacent portion of said plate to the body portion wall, the flange of the lid being formed with a slot opposite to and parallel with the outer edge of the sealing ring.

4. A container for vacuum sealing comprising a body portion open at one end and consisting of a base and an upstanding annular wall, a push-on lid consisting of an end plate and a peripheral flange arranged to fit over the annular wall of the body portion at its open end, and a flexible sealing ring disposed wholly within the compass of the lid flange between the openend of the body portion wall and the end plate of the lid, the lid being provided with an opening in its flange opposite to the edge of the sealing ring, and the lid end plate and body portion wall being so shaped as to avoid the formation of an abutment which would prevent inward movement of the sealing ring by pressure applied to it through the opening in the JAMES DAVID NORMAN WARREN. 

